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Acquisitions and Divestitures	3 Months Ended
Acquisitions and Divestitures	Mar. 31, 2013
Acquisitions and Divestitures [Abstract]
Acquisitions and Divestitures	Acquisitions and Divestitures Divestitures In 2012, we sold our legacy natural gas assets in West Virginia, Kentucky and Virginia. The assignment of certain properties in West Virginia subject to this sale was not completed until January 2013 at which time we received $0.5 million in proceeds, net of transaction costs.